Added I2C support for raspi & first rework of debugging

include/sta/bus/uart/settings.hpp

@@ -0,0 +1,24 @@
+#ifndef STA_CORE_UART_SETTINGS_HPP
+#define STA_CORE_UART_SETTINGS_HPP
+
+#include <stdint.h>
+
+namespace sta
+{
+    enum class UARTMode
+    {
+        RX,
+        TX,
+        RX_TX
+    };
+
+    /**
+     * @brief %UART settings.
+     */
+    struct UARTSettings
+    {
+        UARTMode mode;
+    };
+} // namespace sta
+
+#endif // STA_CORE_UART_SETTINGS_HPP